Inspection Procedure

1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance.
2. Open engine hood and check the following:
   • Harness connectors for improper connections
   • Wiring harness for improper connections, pinches and cut
   • Vacuum hoses for splits, kinks and improper connections
   • Hoses and ducts for leaks
   • Air cleaner clogging
   • Gasket
Fig 1: Inspecting Connectors And Vacuum Hoses
Courtesy of NISSAN MOTOR CO., U.S.A.
3. Confirm that electrical or mechanical loads are not applied.
   • Head lamp switch is OFF.
   • Air conditioner switch is OFF.
   • Rear window defogger switch is OFF.
   • Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.

   Ensure engine stays below 1, 000 rpm.

   Fig 2: Engine Coolant Temperature Indicator Pointing To Middle Of Gauge

   Courtesy of NISSAN MOTOR CO., U.S.A.
5. Run engine at about 2, 000 rpm for about 2 minutes under no load.
Fig 3: Run Engine At 2000 RPM
Courtesy of NISSAN MOTOR CO., U.S.A.
6. Make sure that no DTC is displayed with CONSULT-II or GST.

OK or NG 

1. OK: GO TO  3.
2. NG: GO TO 2.

Repair or replace components as necessary according to corresponding Diagnostic Procedure.

1. : GO TO 3.

With CONSULT-II 

1. Run engine at about 2, 000 rpm for about 2 minutes under no-load.
2. Rev engine (2, 000 to 3, 000 rpm) two or three times under no load, then run engine at idle speed for about 1 minute.
   Fig 4: Revving Engine

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Read idle speed in "DATA MONITOR" mode with CONSULT-II.

   A/T: 650 +/- 50 rpm (in P or N position) 

   M/T: 650 +/- 50 rpm (in N position) 

   Fig 5: Displaying Idle Speed In "DATA MONITOR" Mode With CONSULT-II

   Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II 

1. Run engine at about 2, 000 rpm for about 2 minutes under no-load.
2. Rev engine (2, 000 to 3, 000 rpm) two or three times under no-load, then run engine at idle speed for about 1 minute.
3. Check idle speed.

   A/T: 650 +/- 50 rpm (in P or N position) 

   M/T: 650 +/- 50 rpm (in N position) 

OK or NG 

1. OK: GO TO  10.
2. NG: GO TO 4.

1. Stop engine.
2. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING ".

1. : GO TO 5.

Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".

1. : GO TO 6.

Perform "IDLE AIR VOLUME LEARNING ".

Is Idle Air Volume Learning carried out successfully? 

YES or NO 

1. YES: GO TO 7.
2. NO:
   1. Follow the instruction of Idle Air Volume Learning.
   2. GO TO  4.

With CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in "DATA MONITOR" mode with CONSULT-II.

   A/T: 650 +/- 50 rpm (in P or N position) 

   M/T: 650 +/- 50 rpm (in N position) 

Without CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.

   A/T: 650 +/- 50 rpm (in P or N position) 

   M/T: 650 +/- 50 rpm (in N position) 

OK or NG 

1. OK: GO TO  10.
2. NG: GO TO 8.

Check the following.

• Check camshaft position sensor (PHASE) and circuit. Refer to DTC P0340, P0345 CMP SENSOR (PHASE) .
• Check crankshaft position sensor (POS) and circuit. Refer to DTC P0335 CKP SENSOR (POS) .

OK or NG 

1. OK: GO TO 9.
2. NG:
   1. Repair or replace.
   2. GO TO  4.

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of a incident, but this is the rarely the case.)
2. Perform initialization of IVIS (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to ECM RE-COMMUNICATING FUNCTION in IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS) - G35 COUPE article. .

1. : GO TO  4.

1. Run engine at idle.
2. Check ignition timing with a timing light.

   A/T: 15 +/- 5° BTDC (in P or N position) 

   M/T: 15 +/- 5° BTDC (in N position) 

Fig 6: Checking Ignition Timing
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK (With CONSULT-II): GO TO  19.
2. OK (Without CONSULT-II): GO TO  20.
3. NG: GO TO 11.

1. Stop engine.
2. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING ".

1. : GO TO 12.

Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".

1. : GO TO 13.

Perform "IDLE AIR VOLUME LEARNING ".

Is Idle Air Volume Learning carried out successfully? 

YES or NO 

1. YES: GO TO 14.
2. NO:
   1. Follow the instruction of Idle Air Volume Learning.
   2. GO TO  4.

With CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in "DATA MONITOR" mode with CONSULT-II.

   A/T: 650 +/- 50 rpm (in P or N position) 

   M/T: 650 +/- 50 rpm (in N position) 

Without CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.

   A/T: 650 +/- 50 rpm (in P or N position) 

   M/T: 650 +/- 50 rpm (in N position) 

OK or NG 

1. OK: GO TO 15.
2. NG: GO TO  17.

1. Run engine at idle.
2. Check ignition timing with a timing light.

   A/T: 15 +/- 5° BTDC (in P or N position) 

   M/T: 15 +/- 5° BTDC (in N position) 

Fig 7: Rechecking Ignition Timing
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK (With CONSULT-II): GO TO  19.
2. OK (Without CONSULT-II): GO TO  20.
3. NG: GO TO 16.

Check timing chain installation. Refer to TIMING CHAIN in ENGINE MECHANICAL - G35 COUPE article.

OK or NG 

1. OK: GO TO 17.
2. NG:
   1. Repair the timing chain installation.
   2. GO TO  4.

Check the following.

• Check camshaft position sensor (PHASE) and circuit. Refer to DTC P0340, P0345 CMP SENSOR (PHASE) .
• Check crankshaft position sensor (POS) and circuit. Refer to DTC P0335 CKP SENSOR (POS) .

OK or NG 

1. OK: GO TO 18.
2. NG:
   1. Repair or replace.
   2. GO TO  4.

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of a incident, but this is the rarely the case.)
2. Perform initialization of IVIS (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to ECM RE-COMMUNICATING FUNCTION in IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS) - G35 COUPE article. .

1. : GO TO  4.

With CONSULT-II 

1. Run engine at about 2, 000 rpm for about 2 minutes under no-load.
2. See "HO2S1 MNTR (B1)" in "DATA MONITOR MODE ".
3. Running engine at 2, 000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.

   1 time: RICH --> LEAN --> RICH 

   2 times: RICH --> LEAN --> RICH --> LEAN --> RICH 

Fig 8: Displaying "HO2S1 MNTR (B1)" In "DATA MONITOR" Mode

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO  21.
2. NG (Monitor does not fluctuate.): GO TO  23.
3. NG (Monitor fluctuates less than 5 times.): GO TO  31.

Without CONSULT-II 

1. Stop engine and set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to "HOW TO SWITCH DIAGNOSTIC TEST MODE ".
2. Start engine and run it at about 2, 000 rpm for about 2 minutes under no-load.
3. Running engine at 2, 000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the MIL comes on more than 5 times during 10 seconds.

OK or NG 

1. OK: GO TO  22.
2. NG (MIL does not come on): GO TO  23.
3. NG (MIL comes on less than 5 times): GO TO  31.

With CONSULT-II 

1. See "HO2S1 MNTR (B2)" in "DATA MONITOR MODE ".
2. Running engine at 2, 000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.

   1 time: RICH --> LEAN --> RICH 

   2 times: RICH --> LEAN --> RICH --> LEAN --> RICH 

Fig 9: Displaying "HO2S1 MNTR (B2) " In " DATA MONITOR " Mode

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: INSPECTION END 
2. NG (Monitor does not fluctuate.): GO TO  24.
3. NG (Monitor fluctuates less than 5 times.): GO TO  31.

Without CONSULT-II 

1. Switch the monitored sensor from bank 1 to bank 2. Refer to "HOW TO SWITCH MONITORED SENSOR FROM BANK 1 TO BANK 2 OR VICE VERSA ".
2. Running engine at 2, 000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the MIL comes on more than 5 times during 10 seconds.

OK or NG 

1. OK: INSPECTION END 
2. NG (MIL does not come on): GO TO  24.
3. NG (MIL comes on less than 5 times): GO TO  31.

1. Turn ignition switch OFF and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (bank 1) harness connector.
4. Check harness continuity between ECM terminal 35 and heated oxygen sensor 1 (bank 1) terminal 1. Refer to Wiring Diagram, "BANK 1 ".

   Continuity should exist. 

5. Also check harness for short to ground and short to power.

OK or NG 

1. OK: GO TO  25.
2. NG:
   1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 1).
   2. GO TO  4.

1. Turn ignition switch OFF and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (bank 2) harness connector.
4. Check harness continuity between ECM terminal 16 and heated oxygen sensor 1 (bank 2) terminal 1. Refer to wiring diagram "BANK 2 ".

   Continuity should exist. 

5. Also check harness for short to ground and short to power.

OK or NG 

1. OK: GO TO 25.
2. NG:
   1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 2).
   2. GO TO  4.

1. Reconnect ECM harness connector.
2. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING ".

1. : GO TO 26.

Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".

1. : GO TO 27.

Refer to "IDLE AIR VOLUME LEARNING ".

Is Idle Air Volume Learning carried out successfully? 

YES or NO 

1. YES (With CONSULT-II): GO TO 28.
2. YES (Without CONSULT-II): GO TO  29.
3. NO:
   1. Follow the instruction of Idle Air Volume Learning.
   2. GO TO  4.

With CONSULT-II 

1. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Select "ENG COOLANT TEMP" in "ACTIVE TEST MODE ".
Fig 10: Displaying "ENG COOLANT TEMP" In "ACTIVE TEST" Mode
Courtesy of NISSAN MOTOR CO., U.S.A.
4. Set "ENG COOLANT TEMP" to 5°C (41°F) by touching "DWN" and "Qd".
5. Start engine and rev it (2, 000 to 3, 000 rpm) two or three times under no-load, then run engine at idle speed.
6. Check CO%.

   Idle CO: 0.7 -- 9.9% and engine runs smoothly. 

OK or NG 

1. OK: GO TO  31.
2. NG: GO TO  30.

Without CONSULT-II 

1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. Turn ignition switch OFF.
3. Disconnect engine coolant temperature sensor harness connector.
4. Connect a resistor (4.4 kΩ) between terminals of engine coolant temperature sensor harness connector.
   Fig 11: Connecting Resistor Between Terminals Of Engine Coolant Temperature Sensor Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
5. Start engine and rev it (2, 000 to 3, 000 rpm) two or three times under no-load, then run engine at idle speed.
6. Check CO%.

   Idle CO: 0.7 - 9.9% and engine runs smoothly.

7. After checking CO%, turn ignition switch OFF, disconnect the resistor from the terminals of engine coolant temperature sensor harness connector, and then connect engine coolant temperature sensor harness connector to engine coolant temperature sensor.

OK or NG 

1. OK: GO TO  31.
2. NG: GO TO 30.

1. Turn ignition switch OFF.
2. Reconnect heated oxygen sensor 1 harness connector.

1. : GO TO  34.

1. Stop engine.
2. Replace heated oxygen sensor 1 on the malfunctioning bank.

1. With CONSULT-II: GO TO 32.
2. Without CONSULT-II: GO TO  33.

With CONSULT-II 

1. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
2. See "HO2S1 MNTR (B1)/(B2)" in "DATA MONITOR MODE ".
3. Running engine at 2, 000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.

   1 time: RICH --> LEAN --> RICH 

   2 times: RICH --> LEAN --> RICH --> LEAN --> RICH 

OK or NG 

1. OK: GO TO  4.
2. NG: GO TO  34.

Without CONSULT-II 

1. Set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to "HOW TO SWITCH DIAGNOSTIC TEST MODE ".
2. Switch the monitored sensor to the malfunctioning bank. Refer to "HOW TO SWITCH MONITORED SENSOR FROM BANK 1 TO BANK 2 OR VICE VERSA ".
3. Running engine at 2, 000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the MIL comes on more than 5 times during 10 seconds.

OK or NG 

1. OK: GO TO  4.
2. NG: GO TO 34.

Check the following.

• Check fuel pressure regulator and repair or replace if necessary. Refer to "FUEL PRESSURE CHECK ".
• Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to DTC P0101 MAF SENSOR and DTC P0102, P0103 MAF SENSOR .
• Check injector and its circuit, and repair or replace if necessary. Refer to INJECTOR CIRCUIT .
• Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to DTC P0117, P0118 ECT SENSOR and DTC P0125 ECT SENSOR .

OK or NG 

1. OK: GO TO  36.
2. NG:
   1. Repair or replace.
   2. GO TO 35.

After this inspection, unnecessary DTC might be displayed.

Erase the stored memory in ECM and TCM. Refer to "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION " and HOW TO ERASE DTC in AUTOMATIC TRANSMISSION - G35 COUPE article. .

1. : GO TO  4.

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of a incident, but this is the rarely the case.)
2. Perform initialization of IVIS (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to ECM RE-COMMUNICATING FUNCTION in IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS) - G35 COUPE article. .

1. : GO TO  4.